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What is meant by the term chemical formu...

What is meant by the term chemical formula?

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The chemical formula of a compound represents the composition of a molecule of the compound in term of the symbols of the elements present in it. For example , the chemical formula of water `H_(2)O` tells us that one molecule of water is made up of 2 hydrogen atoms and 1 oxygen atom chemically combined together.
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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
  1. Why is it not possible to see an atom with naked eyes?

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  2. Write down the formulae of (i) sodium oxide (ii) aluminium chlor...

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  3. Write down the names of compounds represented by the following formula...

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  4. What is meant by the term chemical formula?

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  5. How many atoms are present in a (i) H(2)S molecule and (ii) PO...

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  6. Calculate the molecular masses of H(2), O(2), Cl(2), CO(2), CH(4), C(2...

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  7. Calculate the formula unit masses of ZnO, Na(2)O, K(2)CO(3), given ato...

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  8. If one mole of carbon atoms weighs 12 grams, what is the mass (in gram...

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  9. Which has more number of atoms, 100 grams of sodium or 100 grams of ir...

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  10. A 0.24 g sample of compound of oxygen and boron was found by analysis ...

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  11. When 3.0 g of carbon is burnt in 8.0 g oxygen, 11.0 g of carbon dioxid...

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  12. What are polyatomic ions? Give examples.

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  13. Write the chemical formulae of the following. (a) Magnesium chlorid...

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  14. Give the names of the elements present in the following compounds. ...

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  15. Calculate the molar mass of the following substances. (a) Ethyne, ...

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  16. What is the mass of : (a) 1 mole of nitrogen atoms ? (b) 4 moles o...

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  17. Convert into moles : (a) 12 g of oxygen gas (b) 20 g of water ...

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  18. What is the mass of : (a) 0.2 mole of oxygen atoms? (b) 0.5 mole...

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  19. Calculate the number of molecules of sulphur (S(8)) present in 16 g of...

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  20. Calculate the number of aluminium ions present in 0.051 g of aluminium...

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